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Anilist · MALDiablo is the powerful and mysterious Demon King of the demon realm, Gehenna, in the anime series "That Time I Got Reincarnated as a Slime". This enigmatic figure is a man of few words, often dressed in a sleek black tie and exuding an aura of calm confidence. Despite his intimidating appearance, Diablo possesses incredible strength, speed, and magical abilities, making him a formidable opponent in battle. As a loyal servant to Rimuru, the slime protagonist, Diablo uses his impressive skills to aid his master in their adventures, showcasing his impressive combat prowess in the action-packed world of Tempest.